I did as you said and tried it again... i've done a full install, yet when i try to enter that area teha game tells me to insert disc 4, and says it's removed from the drive. So i did so, and the movie played anyways...
Don't know whats wrong
Still thx for the help...
Edit: After the vid freezes, i get the message
"Run Time Error
E:\Program Files\Black Isle\Baldur's Gate\BGMain2.exe
Abnormal program termination"